KR20230019840A - Method for transmitting SRS for a plurality of uplink bands in a wireless communication system and apparatus therefor - Google Patents

Abstract

A method for transmitting a sounding reference signal (SRS) for a plurality of uplink bands in a wireless communication system according to various embodiments is disclosed. Receiving SRS configuration information for the plurality of uplink bands from a base station and transmitting the SRS to the base station in each of the plurality of uplink bands based on the SRS configuration information, wherein the SRS comprises: The SRS configuration information is transmitted through at least one SRS port allocated to each of the plurality of uplink bands, and the at least one SRS port is differently allocated to each of the plurality of uplink bands; and A device for this is disclosed.

Description

Method for transmitting SRS for a plurality of uplink bands in a wireless communication system and apparatus therefor

A method for a terminal to transmit a sounding reference signal (SRS) for a plurality of uplink bands based on SRS configuration information in a wireless communication system and an apparatus therefor.

A wireless communication system is a multiple access system that supports communication with multiple users by sharing available system resources (eg, bandwidth, transmission power, etc.). Examples of multiple access systems include a code division multiple access (CDMA) system, a frequency division multiple access (FDMA) system, a time division multiple access (TDMA) system, an orthogonal frequency division multiple access (OFDMA) system, and a single carrier frequency (SC-FDMA) system. There is a division multiple access (MC-FDMA) system and a multi carrier frequency division multiple access (MC-FDMA) system.

As more and more communication devices require greater communication capacity, a need for improved mobile broadband communication compared to conventional radio access technology (RAT) has emerged. In addition, massive machine type communications (MTC), which provides various services anytime and anywhere by connecting multiple devices and objects, is also one of the major issues to be considered in next-generation communication. In addition, communication system design considering reliability and latency-sensitive services/terminals is being discussed. In this way, the introduction of next-generation wireless access technologies considering enhanced mobile broadband communication, massive MTC, URLLC (Ultra-Reliable and Low Latency Communication), etc. is being discussed, and in the present invention, for convenience, the corresponding technology is called new RAT or NR.

The task to be solved is to perform SRS transmission for each UL band according to the SRS configuration information that sets different SRS ports for each UL band, and provide various frequency domain samples for the uplink channel to provide sophisticated It is to provide a method and apparatus capable of supporting DL channel estimation.

The technical problems are not limited to the above-mentioned technical problems, and other technical problems not mentioned will be clearly understood by those skilled in the art from the following description.

In a wireless communication system according to an aspect, a method for transmitting a sounding reference signal (SRS) for a plurality of uplink bands by a terminal includes the steps of receiving SRS configuration information for the plurality of uplink bands from a base station and the Transmitting the SRS in each of the plurality of uplink bands based on SRS configuration information, wherein the SRS includes at least one SRS port allocated to each of the plurality of uplink bands according to the SRS configuration information and the at least one SRS port may be allocated differently to each of the plurality of uplink bands.

Alternatively, the SRS configuration information is characterized by configuring at least one SRS resource for channel measurement based on reciprocity between uplink and downlink.

Alternatively, when the plurality of uplink bands are N and the number of SRS ports provided in the UE is K, the SRS configuration information indicates that K/N SRS ports are distributed and configured to each of the plurality of uplink bands. to be characterized

Or, further comprising receiving at least one downlink reference signal from the base station, wherein the at least one downlink reference signal is a channel spatial domain obtained from SRSs transmitted in each of the uplink bands. ) information and channel time delay information.

Alternatively, the terminal transmits the SRS in each of the plurality of uplink bands through at least one SRS port allocated by the SRS configuration information based on first control information for triggering transmission of the SRS from the base station. characterized by transmission.

Alternatively, when the terminal receives second control information from the base station after transmitting the SRS in each of the plurality of uplink bands, the at least one band assigned to each uplink band according to a preconfigured hopping pattern. It is characterized in that the index of the SRS port is hopped.

Alternatively, a first time resource unit for transmitting the SRS for a first uplink band among the plurality of uplink bands and a second time resource for indicating transmission of HARQ-ACK for the first uplink band When units overlap each other, all transmissions of the SRS for the first uplink band are dropped.

Alternatively, the SRS configuration information may further include information on a timing gap for switching the uplink band.

In a wireless communication system according to another aspect, a method for receiving a sounding reference signal (SRS) for a plurality of uplink bands by a base station includes transmitting SRS configuration information for the plurality of uplink bands to a terminal, and the and receiving the SRS in each of the plurality of uplink bands based on SRS configuration information, wherein the SRS configuration information allocates at least one SRS port through which the SRS is transmitted in each of the plurality of uplink bands. and the at least one SRS port may be allocated differently for each of the plurality of uplink bands.

Alternatively, the SRS configuration information is characterized by configuring at least one SRS resource for channel measurement based on reciprocity between uplink and downlink.

Alternatively, the base station transmits to the terminal at least one downlink reference signal determined based on channel spatial domain information and channel time delay information obtained from SRSs transmitted in each of the uplink bands. to be characterized

In a wireless communication system according to another aspect, a terminal transmitting a sounding reference signal (SRS) for a plurality of uplink bands includes a radio frequency (RF) transceiver and a processor connected to the RF transceiver, and the processor comprises the RF transceiver. Controls a transceiver to receive SRS configuration information for the plurality of uplink bands from a base station, and transmits the SRS to the base station in each of the plurality of uplink bands based on the SRS configuration information, The SRS configuration information is transmitted through at least one SRS port allocated to each of the plurality of uplink bands, and the at least one SRS port may be differently allocated to each of the plurality of uplink bands.

In a wireless communication system according to another aspect, a base station receiving a sounding reference signal (SRS) for a plurality of uplink bands includes a radio frequency (RF) transceiver and a processor connected to the RF transceiver, and the processor comprises the RF transceiver. A transceiver is controlled to transmit SRS configuration information for the plurality of uplink bands to a UE, and based on the SRS configuration information, the SRS is received in each of the plurality of uplink bands, and the SRS configuration information is the plurality of uplink bands. and information for allocating at least one SRS port through which the SRS is transmitted in each of uplink bands of , and the at least one SRS port may be allocated differently to each of the plurality of uplink bands.

In a wireless communication system, a chip set for transmitting a sounding reference signal (SRS) for a plurality of uplink bands in a wireless communication system is operatively connected to at least one processor and the at least one processor, and when executed, the at least one and at least one memory for causing one processor to perform an operation, wherein the operation is to receive SRS configuration information for the plurality of uplink bands from a base station, and to perform an operation on the plurality of uplinks based on the SRS configuration information. The SRS is transmitted to the base station in each band, and the SRS is transmitted through at least one SRS port allocated to each of the plurality of uplink bands by the SRS configuration information, and the at least one SRS port is It may be allocated differently for each of the plurality of uplink bands.

In a wireless communication system according to another aspect, a computer readable storage medium including at least one computer program for transmitting a sounding reference signal (SRS) for a plurality of uplink bands may cause the at least one processor to perform the operation of transmitting a sounding reference signal (SRS) for a plurality of uplink bands. At least one computer program for performing an SRS transmission operation and a computer readable storage medium in which the at least one computer program is stored, wherein the operation includes SRS configuration information for the plurality of uplink bands from a base station. and transmits the SRS to the base station in each of the plurality of uplink bands based on the SRS configuration information, wherein the SRS is at least one band assigned to each of the plurality of uplink bands by the SRS configuration information. It is transmitted through an SRS port, and the at least one SRS port may be allocated differently for each of the plurality of uplink bands.

Various embodiments provide various frequency domain samples for an uplink channel by performing SRS transmission for each UL band according to SRS configuration information for configuring different SRS ports for each UL band, thereby providing sophisticated DL according to UL/DL channel reciprocity in the base station. Channel estimation can be supported.

Effects obtainable in various embodiments are not limited to the effects mentioned above, and other effects not mentioned can be clearly understood by those skilled in the art from the description below. There will be.

The drawings accompanying this specification are intended to provide an understanding of the present invention, show various embodiments of the present invention, and explain the principles of the present invention together with the description of the specification.
1 shows the structure of an LTE system.
2 shows the structure of the NR system.
3 shows the structure of a radio frame of NR.
4 shows a slot structure of an NR frame.
5 shows an example of a UL BM procedure using SRS.
6 is a flowchart illustrating an example of a UL BM procedure using SRS.
7 is a diagram for explaining a process in which a UE transmits an uplink signal to a base station.
8 shows an example of a procedure for controlling uplink transmission power.
9 is a diagram for explaining signaling between a base station and a terminal.
10 is a flowchart for explaining a method for a terminal to transmit SRS for a plurality of uplink bands.
11 is a flowchart illustrating a method for a base station to receive an SRS from each of a plurality of uplink bands.
12 illustrates a communication system applied to the present invention.
13 illustrates a wireless device that can be applied to the present invention.
14 shows another example of a wireless device applied to the present invention.

A wireless communication system is a multiple access system that supports communication with multiple users by sharing available system resources (eg, bandwidth, transmission power, etc.). Examples of multiple access systems include a code division multiple access (CDMA) system, a frequency division multiple access (FDMA) system, a time division multiple access (TDMA) system, an orthogonal frequency division multiple access (OFDMA) system, and a single carrier frequency (SC-FDMA) system. There is a division multiple access (MC-FDMA) system and a multi carrier frequency division multiple access (MC-FDMA) system.

Sidelink refers to a communication method in which a direct link is established between user equipments (UEs) and voice or data is directly exchanged between the terminals without going through a base station (BS). Sidelink is being considered as one way to solve the burden of a base station according to rapidly increasing data traffic.

V2X (vehicle-to-everything) refers to a communication technology that exchanges information with other vehicles, pedestrians, infrastructure-built objects, etc. through wired/wireless communication. V2X can be divided into four types: V2V (vehicle-to-vehicle), V2I (vehicle-to-infrastructure), V2N (vehicle-to-network), and V2P (vehicle-to-pedestrian). V2X communication may be provided through a PC5 interface and/or a Uu interface.

Meanwhile, as more and more communication devices require greater communication capacity, a need for improved mobile broadband communication compared to conventional radio access technology (RAT) has emerged. Accordingly, a communication system considering reliability and latency-sensitive services or terminals is being discussed, and a next-generation wireless considering improved mobile broadband communication, massive MTC, URLLC (Ultra-Reliable and Low Latency Communication), etc. The access technology may be referred to as new radio access technology (RAT) or new radio (NR). Even in NR, vehicle-to-everything (V2X) communication may be supported.

The following technologies include code division multiple access (CDMA), frequency division multiple access (FDMA), time division multiple access (TDMA), orthogonal frequency division multiple access (OFDMA), single carrier frequency division multiple access (SC-FDMA), and the like. It can be used in various wireless communication systems. CDMA may be implemented with a radio technology such as universal terrestrial radio access (UTRA) or CDMA2000. TDMA may be implemented with a radio technology such as global system for mobile communications (GSM)/general packet radio service (GPRS)/enhanced data rates for GSM evolution (EDGE). OFDMA may be implemented with a wireless technology such as institute of electrical and electronics engineers (IEEE) 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802-20, evolved UTRA (E-UTRA), and the like. IEEE 802.16m is an evolution of IEEE 802.16e, and provides backward compatibility with a system based on IEEE 802.16e. UTRA is part of the universal mobile telecommunications system (UMTS). 3rd generation partnership project (3GPP) long term evolution (LTE) is a part of evolved UMTS (E-UMTS) that uses evolved-UMTS terrestrial radio access (E-UTRA), adopting OFDMA in downlink and SC in uplink -Adopt FDMA. LTE-A (advanced) is an evolution of 3GPP LTE.

5G NR, a successor to LTE-A, is a new clean-slate mobile communication system with characteristics such as high performance, low latency, and high availability. 5G NR can utilize all available spectrum resources, including low-frequency bands below 1 GHz, medium-frequency bands between 1 GHz and 10 GHz, and high-frequency (millimeter wave) bands above 24 GHz.

For clarity of description, LTE-A or 5G NR is mainly described, but the technical idea of the embodiment (s) is not limited thereto.

1 shows the structure of an LTE system that can be applied. This may be called an Evolved-UMTS Terrestrial Radio Access Network (E-UTRAN), or a Long Term Evolution (LTE)/LTE-A system.

Referring to FIG. 1, the E-UTRAN includes a base station (BS) 20 that provides a control plane and a user plane to a terminal 10. The terminal 10 may be fixed or mobile, and may be referred to by other terms such as a mobile station (MS), a user terminal (UT), a subscriber station (SS), a mobile terminal (MT), and a wireless device. . The base station 20 refers to a fixed station that communicates with the terminal 10, and may be called other terms such as an evolved-NodeB (eNB), a base transceiver system (BTS), and an access point.

Base stations 20 may be connected to each other through an X2 interface. The base station 20 is connected to an Evolved Packet Core (EPC) 30 through the S1 interface, and more specifically, to a Mobility Management Entity (MME) through the S1-MME and a Serving Gateway (S-GW) through the S1-U.

The EPC 30 is composed of an MME, an S-GW, and a Packet Data Network-Gateway (P-GW). The MME has access information of the terminal or information about the capabilities of the terminal, and this information is mainly used for mobility management of the terminal. The S-GW is a gateway with E-UTRAN as an endpoint, and the P-GW is a gateway with PDN as endpoint.

The layers of the Radio Interface Protocol between the terminal and the network are based on the lower 3 layers of the Open System Interconnection (OSI) standard model, which is widely known in communication systems, It can be divided into L2 (second layer) and L3 (third layer). Among them, the physical layer belonging to the first layer provides an information transfer service using a physical channel, and the RRC (Radio Resource Control) layer located in the third layer provides radio resources between the terminal and the network. plays a role in controlling To this end, the RRC layer exchanges RRC messages between the terminal and the base station.

2 shows the structure of the NR system.

Referring to FIG. 2, the NG-RAN may include a gNB and/or an eNB that provides user plane and control plane protocol termination to a UE. 7 illustrates a case including only gNB. gNB and eNB are connected to each other through an Xn interface. The gNB and the eNB are connected to a 5G Core Network (5GC) through an NG interface. More specifically, an access and mobility management function (AMF) is connected through an NG-C interface, and a user plane function (UPF) is connected through an NG-U interface.

3 shows the structure of a radio frame of NR.

Referring to FIG. 3, radio frames can be used in uplink and downlink transmission in NR. A radio frame has a length of 10 ms and may be defined as two 5 ms half-frames (Half-Frame, HF). A half-frame may include five 1ms subframes (Subframes, SFs). A subframe may be divided into one or more slots, and the number of slots in a subframe may be determined according to a subcarrier spacing (SCS). Each slot may include 12 or 14 OFDM(A) symbols according to a cyclic prefix (CP).

When a normal CP is used, each slot may include 14 symbols. When an extended CP is used, each slot may include 12 symbols. Here, the symbol may include an OFDM symbol (or CP-OFDM symbol), a Single Carrier-FDMA (SC-FDMA) symbol (or a Discrete Fourier Transform-spread-OFDM (DFT-s-OFDM) symbol).

Table 1 below shows the number of symbols per slot ((N ^slot _symb ), the number of slots per frame ((N ^frame,u _slot ) and the number of slots per subframe according to the SCS setting (u) when the normal CP is used. ((N ^{subframe, u} _slot ) is exemplified.

SCS (15*2 ^u ) N- ^slot _symb N ^{frame, u} _slot N ^{subframe, u} _slot 15KHz (u=0) 14 10 One 30KHz (u=1) 14 20 2 60KHz (u=2) 14 40 4 120KHz (u=3) 14 80 8 240KHz (u=4) 14 160 16

Table 2 illustrates the number of symbols per slot, the number of slots per frame, and the number of slots per subframe according to the SCS when the extended CP is used.

SCS (15*2 ^u ) N- ^slot _symb N ^{frame, u} _slot N ^{subframe, u} _slot 60KHz (u=2) 12 40 4

In the NR system, OFDM (A) numerology (eg, SCS, CP length, etc.) may be set differently among a plurality of cells merged into one UE. Accordingly, (absolute time) intervals of time resources (e.g., subframes, slots, or TTIs) (for convenience, collectively referred to as TU (Time Unit)) composed of the same number of symbols can be set differently between merged cells.

In NR, multiple numerologies or SCSs to support various 5G services can be supported. For example, when the SCS is 15 kHz, wide area in traditional cellular bands can be supported, and when the SCS is 30 kHz/60 kHz, dense-urban, lower latency and wider carrier bandwidth may be supported. When the SCS is 60 kHz or higher, a bandwidth greater than 24.25 GHz may be supported to overcome phase noise.

An NR frequency band may be defined as two types of frequency ranges. The two types of frequency ranges may be FR1 and FR2. The number of frequency ranges may be changed, and for example, the two types of frequency ranges may be shown in Table 3 below. Among the frequency ranges used in the NR system, FR1 may mean "sub 6 GHz range" and FR2 may mean "above 6 GHz range" and may be called millimeter wave (mmW).

Frequency range designation Corresponding frequency range Subcarrier Spacing (SCS) FR1 450MHz - 6000MHz 15, 30, 60 kHz FR2 24250MHz - 52600MHz 60, 120, 240 kHz

As described above, the number of frequency ranges of the NR system can be changed. For example, FR1 may include a band of 410 MHz to 7125 MHz as shown in Table 4 below. That is, FR1 may include a frequency band of 6 GHz (or 5850, 5900, 5925 MHz, etc.) or higher. For example, a frequency band of 6 GHz (or 5850, 5900, 5925 MHz, etc.) or higher included in FR1 may include an unlicensed band. The unlicensed band may be used for various purposes, and may be used, for example, for vehicle communication (eg, autonomous driving).

Frequency range designation Corresponding frequency range Subcarrier Spacing (SCS) FR1 410MHz - 7125MHz 15, 30, 60 kHz FR2 24250MHz - 52600MHz 60, 120, 240 kHz

4 shows a slot structure of an NR frame.

Referring to FIG. 4, a slot includes a plurality of symbols in the time domain. For example, in the case of a normal CP, one slot includes 14 symbols, but in the case of an extended CP, one slot may include 12 symbols. Alternatively, in the case of a normal CP, one slot includes 7 symbols, but in the case of an extended CP, one slot may include 6 symbols.

A carrier includes a plurality of subcarriers in the frequency domain. A resource block (RB) may be defined as a plurality of (eg, 12) consecutive subcarriers in the frequency domain. A bandwidth part (BWP) may be defined as a plurality of consecutive (P)RBs ((Physical) Resource Blocks) in the frequency domain, and may correspond to one numerology (eg, SCS, CP length, etc.) there is. A carrier may include up to N (eg, 5) BWPs. Data communication may be performed through an activated BWP. Each element may be referred to as a resource element (RE) in the resource grid, and one complex symbol may be mapped.

Meanwhile, a radio interface between a terminal and a terminal or a radio interface between a terminal and a network may be composed of an L1 layer, an L2 layer, and an L3 layer. In various embodiments of the present disclosure, the L1 layer may mean a physical layer. Also, for example, the L2 layer may mean at least one of a MAC layer, an RLC layer, a PDCP layer, and an SDAP layer. Also, for example, the L3 layer may mean an RRC layer.

Bandwidth part (BWP)

NR systems can support up to 400 MHz per component carrier (CC). If a terminal operating in such a wideband CC always operates with RF for the entire CC turned on, battery consumption of the terminal may increase. Alternatively, when considering multiple use cases (e.g., eMBB, URLLC, Mmtc, V2X, etc.) operating within one wideband CC, different numerologies (e.g., sub-carrier spacing) can be supported for each frequency band within the CC. Alternatively, capability for maximum bandwidth may be different for each terminal. Considering this, the base station may instruct the terminal to operate only in a part of the bandwidth rather than the entire bandwidth of the wideband CC, and the part of the bandwidth is defined as a bandwidth part (BWP) for convenience. BWP may be composed of consecutive resource blocks (RBs) on the frequency axis, and may correspond to one numerology (e.g., sub-carrier spacing, CP length, slot/mini-slot duration).

Meanwhile, the base station can set multiple BWPs even within one CC configured for the terminal. For example, in a PDCCH monitoring slot, a BWP occupying a relatively small frequency domain may be set, and a PDSCH indicated by the PDCCH may be scheduled on a larger BWP. Alternatively, when UEs are concentrated in a specific BWP, some UEs may be set to other BWPs for load balancing. Alternatively, considering frequency domain inter-cell interference cancellation between neighboring cells, some spectrums among the entire bandwidth may be excluded and both BWPs may be set even within the same slot. That is, the base station may configure at least one DL / UL BWP for a terminal associated with a wideband CC, and at a specific time, at least one DL / UL BWP among the configured DL / UL BWP (s) (L1 signaling or MAC It can be activated (by CE or RRC signaling, etc.) and switching to another configured DL/UL BWP can be indicated (by L1 signaling or MAC CE or RRC signaling, etc.), or when the timer value expires based on the timer, can also be switched. At this time, the activated DL/UL BWP is defined as active DL/UL BWP. However, in situations such as when the terminal is in the process of initial access or before the RRC connection is set up, it may not be able to receive the configuration for DL/UL BWP. In this situation, the DL/UL BWP assumed by the terminal is initial active DL Defined as /UL BWP.

5 shows an example of a UL BM procedure using SRS.

Referring to FIG. 5 (a), the base station may perform an Rx beam determination procedure, and referring to FIG. 5 (b), the terminal may perform a Tx beam sweeping procedure.

In addition, even when both the base station and the terminal maintain beam correspondence, the base station can use the UL BM procedure to determine the DL Tx beam without the terminal requesting a report of a preferred beam.

UL BM may be performed through beamformed UL SRS transmission, and whether or not UL BM is applied to the SRS resource set is set by (higher layer parameter) usage. When usage is set to 'BeamManagement (BM)', only one SRS resource can be transmitted to each of a plurality of SRS resource sets at a given time instant.

The UE may receive one or more Sounding Reference Symbol (SRS) resource sets configured by (higher layer parameter) SRS-ResourceSet (via higher layer signaling, RRC signaling, etc.). For each SRS resource set, the UE may configure K≥1 SRS resources (higher later parameter SRS-resource). Here, K is a natural number, and the maximum value of K is indicated by SRS_capability.

Like the DL BM, the UL BM procedure can also be divided into Tx beam sweeping of the UE and Rx beam sweeping of the base station.

6 is a flowchart illustrating an example of a UL BM procedure using SRS.

Referring to FIG. 6 , in the UL BM, beam reciprocity (or beam correspondence) between a Tx beam and an Rx beam may or may not be established according to UE implementation. If reciprocity between Tx beam and Rx beam is established in both the base station and the terminal, a UL beam pair can be matched through a DL beam pair. However, if reciprocity between Tx beam and Rx beam is not established in either of the base station and the terminal, a UL beam pair determination process is required separately from the DL beam pair determination.

The terminal receives RRC signaling (eg, SRS-Config IE) including usage parameters (higher layer parameters) set to 'beam management' from the base station (S1010).

The UE determines a Tx beam for an SRS resource to be transmitted based on SRS-SpatialRelation Info included in the SRS-Config IE (S1020). Here, SRS-SpatialRelation Info is set for each SRS resource and indicates whether to apply the same beam as the beam used in SSB, CSI-RS or SRS for each SRS resource. In addition, SRS-SpatialRelationInfo may or may not be set for each SRS resource. If SRS-SpatialRelationInfo is set in the SRS resource, the same beam used in SSB, CSI-RS or SRS is applied and transmitted. However, if SRS-SpatialRelationInfo is not set in the SRS resource, the terminal randomly determines a Tx beam and transmits the SRS through the determined Tx beam (S1030).

More specifically, for a P-SRS with 'SRS-ResourceConfigType' set to 'periodic':

i) When SRS-SpatialRelationInfo is set to 'SSB/PBCH', the UE applies the same spatial domain transmission filter as the spatial domain Rx filter used for SSB/PBCH reception (or generated from the corresponding filter) to the corresponding SRS resource transmit; or

ii) When SRS-SpatialRelationInfo is set to 'CSI-RS', the UE transmits the SRS resource by applying the same spatial domain transmission filter used for reception of periodic CSI-RS or SP CSI-RS; or

iii) When SRS-SpatialRelationInfo is set to 'SRS', the UE transmits the corresponding SRS resource by applying the same spatial domain transmission filter used for transmission of periodic SRS.

Even when 'SRS-ResourceConfigType' is set to 'SP-SRS' or 'AP-SRS', beam determination and transmission operations can be applied similarly to the above.

- Additionally, the terminal may or may not receive feedback on the SRS from the base station in the following three cases (S1040).

i) When Spatial_Relation_Info is set for all SRS resources in the SRS resource set, the UE transmits the SRS through the beam indicated by the base station. For example, when Spatial_Relation_Info indicates the same SSB, CRI, or SRI, the UE repeatedly transmits the SRS with the same beam.

ii) Spatial_Relation_Info may not be set for all SRS resources in the SRS resource set. In this case, the UE can freely transmit while changing the SRS beam.

iii) Spatial_Relation_Info can be set only for some SRS resources in the SRS resource set. In this case, the SRS can be transmitted with the indicated beam for the configured SRS resource, and the UE can arbitrarily apply and transmit the Tx beam for the SRS resource for which Spatial_Relation_Info is not set.

7 is a diagram for explaining a process in which a UE transmits an uplink signal to a base station.

Referring to FIG. 7, the base station schedules uplink transmission such as frequency/time resources, transport layer, uplink precoder, and MCS (S1501). In particular, the base station may determine a beam for the UE to transmit the PUSCH through the above-described operations.

The terminal receives DCI for uplink scheduling (ie, including PUSCH scheduling information) from the base station on the PDCCH (S1502).

DCI format 0_0 or 0_1 can be used for uplink scheduling, and in particular, DCI format 0_1 includes the following information: DCI format identifier (Identifier for DCI formats), UL/SUL (Supplementary Uplink) indicator (UL/ SUL indicator), bandwidth part indicator, frequency domain resource assignment, time domain resource assignment, frequency hopping flag, modulation and coding scheme (MCS) : Modulation and coding scheme), SRS resource indicator (SRI), precoding information and number of layers, antenna port (s), SRS request (SRS request), DMRS sequence initialization, UL-SCH (Uplink Shared Channel) indicator (UL-SCH indicator)

In particular, SRS resources set in the SRS resource set associated with the higher layer parameter 'usage' may be indicated by the SRS resource indicator field. In addition, 'spatialRelationInfo' can be set for each SRS resource, and its value can be one of {CRI, SSB, SRI}.

The terminal transmits uplink data to the base station on the PUSCH (S1503).

When the terminal detects a PDCCH including DCI format 0_0 or 0_1, it transmits the corresponding PUSCH according to the instruction by the corresponding DCI.

For PUSCH transmission, two transmission schemes are supported: codebook-based transmission and non-codebook-based transmission:

i) When the upper layer parameter 'txConfig' is set to 'codebook', the terminal is configured for codebook-based transmission. On the other hand, when the upper layer parameter 'txConfig' is set to 'nonCodebook', the terminal is configured for non-codebook based transmission. If the upper layer parameter 'txConfig' is not set, the terminal does not expect to be scheduled by DCI format 0_1. When PUSCH is scheduled by DCI format 0_0, PUSCH transmission is based on a single antenna port.

In the case of codebook-based transmission, PUSCH may be scheduled in DCI format 0_0, DCI format 0_1, or semi-statically. If this PUSCH is scheduled by DCI format 0_1, the UE transmits the PUSCH based on SRI, TPMI (Transmit Precoding Matrix Indicator) and transmission rank from DCI, as given by the SRS resource indicator field and Precoding information and number of layers field Determine the precoder. TPMI is used to indicate a precoder to be applied across antenna ports, and corresponds to an SRS resource selected by SRI when multiple SRS resources are configured. Or, if a single SRS resource is configured, TPMI is used to indicate a precoder to be applied across antenna ports and corresponds to the single SRS resource. A transmission precoder is selected from an uplink codebook having the same number of antenna ports as the upper layer parameter 'nrofSRS-Ports'. When the upper layer in which the terminal is set to 'codebook' is set to the parameter 'txConfig', the terminal is configured with at least one SRS resource. The SRI indicated in slot n is associated with the most recent transmission of the SRS resource identified by the SRI, where the SRS resource precedes the PDCCH carrying the SRI (i.e., slot n).

ii) In case of non-codebook based transmission, PUSCH may be scheduled in DCI format 0_0, DCI format 0_1 or semi-statically. When multiple SRS resources are configured, the UE can determine the PUSCH precoder and transmission rank based on the wideband SRI, where the SRI is given by the SRS resource indicator in the DCI or by the higher layer parameter 'srs-ResourceIndicator' given The UE uses one or multiple SRS resources for SRS transmission, where the number of SRS resources may be configured for simultaneous transmission within the same RB based on UE capability. Only one SRS port is configured for each SRS resource. Only one SRS resource can be set with the upper layer parameter 'usage' set to 'nonCodebook'. The maximum number of SRS resources that can be configured for non-codebook based uplink transmission is 4. The SRI indicated in slot n is associated with the most recent transmission of the SRS resource identified by the SRI, where the SRS transmission precedes the PDCCH carrying the SRI (i.e., slot n).

8 shows an example of a procedure for controlling uplink transmission power.

First, a user equipment (UE) may receive parameters and/or information related to transmit power (Tx power) from a base station (P05). In this case, the terminal may receive corresponding parameters and / or information through higher layer signaling (eg, RRC signaling, MAC-CE, etc.). For example, in connection with PUSCH transmission, PUCCH transmission, SRS transmission, and/or PRACH transmission, the terminal may receive parameters and/or information related to transmission power control.

Thereafter, the terminal may receive a TPC command related to transmission power from the base station (P10). In this case, the terminal may receive the corresponding TPC command through lower layer signaling (eg, DCI). For example, in connection with PUSCH transmission, PUCCH transmission, and/or SRS transmission, the terminal may receive information on a TPC command to be used to determine a power control adjustment state through a TPC command field of a predefined DCI format. . However, in the case of PRACH transmission, the corresponding step may be omitted.

Thereafter, the terminal may determine (or calculate) transmission power for uplink transmission based on the parameter, information, and/or TPC command received from the base station (P15). As an example, the UE may determine PUSCH transmission power (or PUCCH transmission power, SRS transmission power, and/or PRACH transmission power) based on Equation 1 below. And/or, when two or more uplink channels and/or signals need to overlap and be transmitted, such as in carrier aggregation, the UE transmits for uplink transmission in consideration of priority order, etc. power can be determined.

Thereafter, the UE may transmit one or more uplink channels and/or signals (eg, PUSCH, PUCCH, SRS, PRACH, etc.) to the base station based on the determined (or calculated) transmit power. Yes (P20).

The following describes contents related to power control.

In a wireless communication system, it may be necessary to increase or decrease transmit power of a terminal (eg, User Equipment, UE) and/or a mobile device according to circumstances. Controlling transmission power of a terminal and/or a mobile device in this way may be referred to as uplink power control. As an example, the transmission power control method is based on the requirements (eg, Signal-to-Noise Ratio (SNR), Bit Error Ratio (BER), Block Error Ratio (BLER)) in the base station (eg gNB, eNB, etc.) etc.) can be applied to satisfy

Power control as described above may be performed using an open-loop power control method and a closed-loop power control method.

Specifically, the open-loop power control method is a method of controlling transmission power without feedback from a transmitting device (eg, a base station, etc.) to a receiving device (eg, a terminal, etc.) and/or from a receiving device to a transmitting device. it means. For example, the terminal may receive a specific channel/signal (pilot channel/signal) from the base station and estimate the strength of the received power by using the pilot channel/signal. Thereafter, the UE can control transmit power using the strength of the estimated received power.

In contrast, the closed-loop power control method refers to a method of controlling transmission power based on feedback from a transmission device to a reception device and/or from a reception device to a transmission device. As an example, the base station receives a specific channel / signal from the terminal, and based on the power level measured by the received specific channel / signal, SNR, BER, BLER, etc., the optimal power level of the terminal (optimum power level) decide The base station transmits information (i.e., feedback) on the determined optimal power level to the terminal through a control channel, etc., and the terminal can control transmission power using the feedback provided by the base station.

Hereinafter, a power control scheme for cases in which a terminal and/or a mobile device performs uplink transmission to a base station in a wireless communication system will be described in detail.

Specifically, 1) uplink data channel (eg Physical Uplink Shared Channel (PUSCH), 2) uplink control channel (eg Physical Uplink Control Channel (PUCCH), 3) Sounding Reference Signal (SRS) ), 4) power control schemes for transmission of a random access channel (e.g., Physical Random Access Channel (PRACH)) are described. At this time, transmission occasions (ie, transmission occasions) for PUSCH, PUCCH, SRS and / or PRACH are described. Transmission time unit) (i) is the slot index (n_s) in the frame of the system frame number (SFN), the first symbol (S) in the slot, and the number of consecutive symbols (L) etc. can be defined.

Hereinafter, for convenience of explanation, a power control method will be described based on a case in which a UE performs PUSCH transmission. Of course, the corresponding method can be extended and applied to other uplink data channels supported in the wireless communication system.

In the case of PUSCH transmission in an active UL bandwidth part (UL BWP) of a carrier (f) of a serving cell (c), the UE uses Equation P1 below A linear power value of the determined transmission power may be calculated. Thereafter, the corresponding terminal may control transmit power by considering the calculated linear power value in consideration of the number of antenna ports and/or the number of SRS ports.

)(dBm)를 결정할 수 있다.Specifically, the UE activates the carrier f of the serving cell c by using a parameter set configuration based on index j and a PUSCH power control adjustment state based on index l. When PUSCH transmission is performed in the UL BWP (b), the UE transmits power of the PUSCH in the PUSCH transmission opportunity (i) based on Equation 1 below (

) (dBm) can be determined.

In Equation 1, index j represents an index for an open-loop power control parameter (eg, Po, alpha, etc.), and up to 32 parameter sets can be set per cell. Index q_d represents an index of a DL RS resource for PathLoss (PL) measurement, and up to 4 measurements can be set per cell. Index 1 represents an index for a closed-loop power control process, and up to two processes can be set per cell.

는 서브캐리어 간격(subcarrier spacing)에 기반하여 PUSCH 전송 기회에 대한 자원 블록(resource block, RB)의 수로 표현되는 PUSCH 자원 할당의 대역폭(bandwidth)을 나타낼 수 있다. 또한, PUSCH 전력 제어 조정 상태와 관련된 f_b,f,c(i,l)는 DCI(예: DCI format 0_0, DCI format 0_1, DCI format 2_2, DCI format2_3 등)의 TPC 명령 필드(TPC command field)에 기반하여 설정 또는 지시될 수 있다.Specifically, Po is a parameter broadcast as part of system information, and may indicate target received power at the receiving side. The corresponding Po value may be set in consideration of UE throughput, cell capacity, noise and/or interference. Also, alpha may indicate a rate at which compensation for path loss is performed. Alpha can be set to a value from 0 to 1, and full pathloss compensation or fractional pathloss compensation can be performed according to the set value. In this case, the alpha value may be set in consideration of interference between terminals and/or data rate. In addition, P _CMAX,f,c (i) may indicate set UE transmit power. For example, the configured UE transmission power may be interpreted as 'configured maximum UE output power' defined in 3GPP TS 38.101-1 and/or TS38.101-2. also,

may represent the bandwidth of PUSCH resource allocation expressed as the number of resource blocks (RBs) for PUSCH transmission opportunities based on subcarrier spacing. In addition, f _b,f,c (i,l) related to the PUSCH power control adjustment state is a TPC command field of DCI (eg DCI format 0_0, DCI format 0_1, DCI format 2_2, DCI format2_3, etc.) It can be set or instructed based on.

In this case, a specific RRC (Radio Resource Control) parameter (eg, SRI-PUSCHPowerControl-Mapping, etc.) is a linkage relationship (linkage) between the SRI (SRS Resource Indicator) field of DCI (downlink control information) and the aforementioned indexes j, q_d, and l. ) can be expressed. In other words, the aforementioned indices j, l, q_d, etc. may be associated with a beam, a panel, and/or a spatial domain transmission filter based on specific information. Through this, PUSCH transmit power control can be performed in beam, panel, and/or spatial domain transmit filter units.

Parameters and/or information for PUSCH power control described above may be individually (ie, independently) set for each BWP. In this case, the corresponding parameters and / or information may be set or indicated through higher layer signaling (eg, RRC signaling, Medium Access Control-Control Element (MAC-CE), etc.) and / or DCI. For example, parameters and/or information for PUSCH power control may be delivered through RRC signaling PUSCH-ConfigCommon, PUSCH-PowerControl, and the like.

SRS switching for accurate channel estimation

Hereinafter, methods for effectively performing channel estimation using SRS antenna switching in a system such as NR using multiple antennas are proposed. More specifically, when DL channel estimation is performed using UL/DL channel reciprocity including FDD, it is a method for setting SRS to obtain more accurate channel information.

On the other hand, in some scenarios, the CSI is not reported for each subband based on correlation in the frequency domain of the reporting subband (reporting (sub)-band of configured bandwidth) of the configured bandwidth set in the UE, but is reduced to one CSI. Therefore, a method of performing CSI reporting may be considered. Here, the correlation in the frequency domain may be interpreted as a delay in the time domain.

Alternatively, as another scenario, an enhancement method of CSI reporting in which CSI is reported based on UL/DL reciprocity in FDD may be considered. That is, the base station can obtain a specific basis vector constituting the channel from the UL channel of the terminal and its delay characteristics, and the specific basis vector and delay characteristics (or channel spatial domain (spatial vector) DL RS (e.g. CSI-RS) may be applied or set in consideration of at least one of domain) information and channel time delay information). In this case, when the UE acquires the CSI of the DL channel and reports the CSI of the DL channel, the base vector and its delay information obtainable from the UL channel (ie, frequency domain basis vector information, or channel spatial domain (spatial domain) information and channel time delay information) may be omitted, and through this, reduction of additional overhead and/or performance gain may be improved. In particular, in the case of FDD, the above effect can be achieved by effectively improving the UL channel acquisition step (ie, SRS resource transmission).

1) Example 1

For effective UL / DL channel acquisition as described above, the base station considers switching between the antenna (port) of the terminal and the UL carrier (and / or UL BWP, UL band) SRS resources (or, SRS resource set) setting and/or instruction. Meanwhile, the CC and BWP may correspond to UL bands, and may be CC and BWP for uplink (UL).

In relation to the first embodiment, the UE may set/instruct a plurality of SRS resources to different CCs (component carriers). That is, the base station may set/instruct a plurality of SRS resources or SRS resource sets to the terminal, and the plurality of SRS resources or SRS resource sets are at least one SRS resource corresponding to/related to different CCs (/BWP) can be included In addition, each SRS resource may include one or more SRS ports, and the SRS ports included in each SRS resource may correspond to or be mapped to different TX chains (and/or Tx ports) of the terminal. Alternatively, the base station may configure at least one SRS resource and/or SRS port related to a plurality of CCs or BWPs for one SRS time resource (or SRS transmission occasion) to the UE.

For example, a 4-port SRS may not be transmitted in one resource, but divided into 2-ports and transmitted separately in two SRS resources, respectively. Specifically, SRS port #0 and SRS port #1 are transmitted through CC1 (or BWP1), and SRS port #2 and SRS port #3 are transmitted through CC2 (or BWP2) (or SRS port #0 and SRS port #1 may be transmitted in CC1 through the first SRS resource, and SRS port #2 and SRS port #3 may be transmitted in CC2 through the second SRS resource). In other words, according to the above proposal, for UL channel measurement of a UE having an M-Tx chain (or M-Tx port), M _i -Tx (where i = 1, ..., N, M_1 + M_2 + ... + SRS ports corresponding to M_N = M) can be divided into a plurality of (eg N) resources (or SRS resources) and transmitted to different CCs or BWPs. In this case, more samples of the frequency domain of the UL channel can be obtained, and more sophisticated channel estimation can be performed therefrom.

In other words, the base station may deliver SRS configuration information for distributing a plurality of SRS ports of the terminal for each CC or BWP to the terminal. For example, the SRS configuration information may include information for configuring an SRS port for each of a plurality of CCs in one SRS time resource, and the SRS port may be configured differently among a plurality of CCs.

Alternatively, in relation to the above embodiment 1, SRS port #0 and SRS port #1 may be transmitted through CC1 (/BWP1), and SRS port #0 and SRS port #1 may be transmitted through CC2 (/BWP2) there is. In this case, only the SRS-resource id is shared/configured (eg, each SRS resource corresponding to each SRS-resource id can be associated with/corresponds to a different CC/BWP), and during actual SRS transmission, the ports of each CC It is transmitted after being mapped to different Tx chains (and/or ports) of the terminal. Alternatively, for specific indication, port mapping for each resource may be separately indicated with an id (eg, UL panel id) related to antenna port mapping in SRS-resource configuration. In other words, even though the SRS port configuration is the same for each SRS resource, the Tx chain/Tx port of the UE corresponding to each SRS resource is different.

Specifically, in the above proposal, the UE may map M _i -Tx chains (or M _i -TX ports) to multiple CCs (or BWPs) in consideration of the following assumptions.

- Assumption 1 (Alt1): SRS usage within the SRS resource set can be specified (eg, reciprocity measurement). SRS resources mapped to each CC (or BWP) can be transmitted using different physical Tx-chains (or Tx ports), and the base station maps the UE to different physical Tx-chains (or Tx ports). Therefore, it can be expected to transmit SRS resources. For example, the resource-port mapping (or SRS resource-Tx port mapping) may be set/instructed by a base station according to a predefined-rule.

-Assumption 2 (Alt2): The UE transmits the SRS resources mapped to each CC (or BWP) in the SRS resource set for the corresponding purpose to the UE's preferred Tx port (but not overlapped), and the base station transmits the SRS sequence Based on the Tx port can be distinguished. Here, the preferred Tx port can be set or applied as a Tx port with the best specific metric (such as the best SINR or RSRP) in a specific CC / BWP. Alternatively, the preferred Tx port may be a Tx port associated with the maximum PA (full rated PA, that is, a power amplifier capable of full power) of the UE.

Embodiment 1 may be aimed at accurate channel measurement based on reciprocity in FDD. In this case, the UL band (or UL BWP) close to the DL (active) band (or DL (active) BWP) configured for the UE needs to be set for channel acquisition using the corresponding SRS. Alternatively, the degree of reciprocity of the UL / DL channel can be improved or increased by setting the UL band to come from the top and bottom adjacent to one DL band.

Hereinafter, Table 5 shows UL/DL bands configurable in NR FR1. For example, referring to Table 1, when CA is configured with a combination of n1-n3, UL bands below / above the DL band of n1 may be set for channel acquisition using SRS. In this case, in FDD UL/DL channel estimation performance based on reciprocity between UL/DL channels can be improved.

NR operating band Uplink (UL) operating band
BS receive / UE transmit
F _{UL_low} - F _{UL_high}
Downlink (DL) operating band
BS transmit / UE receive
F _{DL_low} - F _{DL_high} Duplex mode n1 1920 MHz - 1980 MHz 2110 MHz - 2170 MHz FDD n2 1850 MHz - 1910 MHz 1930 MHz - 1990 MHz FDD n3 1710 MHz - 1785 MHz 1805 MHz - 1880 MHz FDD n5 824 MHz - 849 MHz 869 MHz - 894 MHz FDD n7 2500 MHz - 2570 MHz 2620 MHz - 2690 MHz FDD n8 880 MHz - 915 MHz 925 MHz - 960 MHz FDD n12 699 MHz - 716 MHz 729 MHz - 746 MHz FDD n14 788 MHz - 798 MHz 758 MHz - 768 MHz FDD n18 815 MHz - 830 MHz 860 MHz - 875 MHz FDD n20 832 MHz - 862 MHz 791 MHz - 821 MHz FDD n25 1850 MHz - 1915 MHz 1930 MHz - 1995 MHz FDD n28 703 MHz - 748 MHz 758 MHz - 803 MHz FDD n29 N/A 717 MHz - 728 MHz SDL n30 ³ 2305 MHz - 2315 MHz 2350 MHz - 2360 MHz FDD n34 2010 MHz - 2025 MHz 2010 MHz - 2025 MHz TDD n38 2570 MHz - 2620 MHz 2570 MHz - 2620 MHz TDD n39 1880 MHz - 1920 MHz 1880 MHz - 1920 MHz TDD n40 2300 MHz - 2400 MHz 2300 MHz - 2400 MHz TDD n41 2496 MHz - 2690 MHz 2496 MHz - 2690 MHz TDD n48 3550 MHz - 3700 MHz 3550 MHz - 3700 MHz TDD n50 1432 MHz - 1517 MHz 1432 MHz - 1517 MHz TDD ¹ n51 1427 MHz - 1432 MHz 1427 MHz - 1432 MHz TDD n65 1920 MHz - 2010 MHz 2110 MHz - 2200 MHz FDD ⁴ n66 1710 MHz - 1780 MHz 2110 MHz - 2200 MHz FDD n70 1695 MHz - 1710 MHz 1995 MHz - 2020 MHz FDD n71 663 MHz - 698 MHz 617 MHz - 652 MHz FDD n74 1427 MHz - 1470 MHz 1475 MHz - 1518 MHz FDD n75 N/A 1432 MHz - 1517 MHz SDL n76 N/A 1427 MHz - 1432 MHz SDL n77 3300 MHz - 4200 MHz 3300 MHz - 4200 MHz TDD n78 3300 MHz - 3800 MHz 3300 MHz - 3800 MHz TDD n79 4400 MHz - 5000 MHz 4400 MHz - 5000 MHz TDD n80 1710 MHz - 1785 MHz N/A SUL n81 880 MHz - 915 MHz N/A SUL n82 832 MHz - 862 MHz N/A SUL n83 703 MHz - 748 MHz N/A SUL n84 1920 MHz - 1980 MHz N/A SUL n86 1710 MHz - 1780 MHz N/A SUL n89 824 MHz - 849 MHz N/A SUL n90 2496 MHz - 2690 MHz 2496 MHz - 2690 MHz TDD ⁵ n91 832 MHz - 862 MHz 1427 MHz - 1432 MHz FDD ⁹ n92 832 MHz - 862 MHz 1432 MHz - 1517 MHz FDD ⁹ n93 880 MHz - 915 MHz 1427 MHz - 1432 MHz FDD ⁹ n94 880 MHz - 915 MHz 1432 MHz - 1517 MHz FDD ⁹ n95 ⁸ 2010 MHz - 2025 MHz N/A SUL NOTE 1: UE that complies with the NR Band n50 minimum requirements in this specification shall also comply with the NR Band n51 minimum requirements.
NOTE 2: UE that complies with the NR Band n75 minimum requirements in this specification shall also comply with the NR Band n76 minimum requirements.
NOTE 3: Uplink transmission is not allowed at this band for UE with external vehicle-mounted antennas.
NOTE 4: A UE that complies with the NR Band n65 minimum requirements in this specification shall also comply with the NR Band n1 minimum requirements.
NOTE 5: Unless otherwise stated, the applicability of requirements for Band n90 is in accordance with that for Band n41; a UE supporting Band n90 shall meet the requirements for Band n41.
NOTE 6: A UE that supports s NR Band n66 shall receive in the entire DL operating band.
NOTE 7: A UE that supports NR Band n66 and CA operation in any CA band shall also comply with the minimum requirements specified for the DL CA configurations CA_n66B and CA_n66(2A) in the current version of the specification.
NOTE 8: This band is applicable in China only.
NOTE 9: Variable duplex operation does not enable dynamic variable duplex configuration by the network, and is used such that DL and UL frequency ranges are supported independently in any valid frequency range for the band.

2) Example 2

Alternatively, a plurality of SRS ports may be mapped to SRS resources configured over a plurality of UL bands (or BWPs) according to a specific rule / setting for effective UL / DL channel measurement in FDD, and at least The transmission order/position of one SRS port may be set or determined according to a specific rule/configuration.

In relation to the above embodiment 2, port-wise frequency hopping of the UE may be considered. For example, the sequence of CC/BWP in which port-wise frequency hopping is performed may be repeated in a cyclic shift scheme. That is, the order of port-wise frequency hopping may be set in ascending/descending order based on the SRS resource id to which the SRS port index (or SRS port) is mapped. For example, a UE may perform UL transmission on two CCs (e.g. CC#0 and CC#1) using a total of four Tx or antennas (eg, ports #0/#1/#2/#3). . In this case, the base station may promise or configure an SRS transmission operation based on the following order to the terminal.

- SRS Port#0 & UL CC#0 -> SRS Port#1 & UL CC#1 -> SRS Port#2 & UL CC#0 -> SRS Port#3 & UL CC#1

That is, SRS transmission may be performed in ascending order of SRS port numbers and ascending order of CC indexes (considering cyclic shift).

Here, ports of SRS transmitted for each CC may be mapped to different physical antennas/Tx chains. Whether or not the corresponding mapping is applied may be indicated by the base station to the terminal through a higher layer signal (MAC-CE or RRC) or DCI.

In relation to the second embodiment, transmission of a plurality of SRS resources within the same CC may be limited to transmission within the same time unit (eg, slot) in order to increase channel measurement accuracy. Meanwhile, although the above-described embodiments are applied to component carriers (CCs) as an example, they are also applicable to a plurality of BWPs.

Alternatively, the base station may promise or set an SRS transmission operation based on the following order to the terminal.

- SRS Port#0 &Port#1 & UL CC#0 -> SRS Port#2 &Port#3 & UL CC#1 -> SRS Port#2 &Port#3 & UL CC#0 -> SRS Port#0 and #1 & UL CC#1

That is, the SRS transmission or UL transmission may be performed in units of at least two or more SRS port groups having consecutive port indices, and may be performed in ascending order and cyclic shift of CC indices.

In this case, it may include a case in which all Tx ports (or chains) or antenna ports used for UL channel acquisition are used in configured CC or BWP. In this case, the base station may acquire a UL channel by applying weighting or filtering to a specific CC or BWP in order to increase the accuracy of UL transmission. The base station may inform the terminal of the above-described weighting or filtering information, and a higher priority may be set or applied when SRS transmission collides with another channel (eg, PUSCH).

Additionally, when the SRS resources used in the above embodiments 1 and 2 collide with a channel (eg, PUCCH or PUSCH) including HARQ-ACK (eg, ACK/NACK), the UE performs the following SRS transmission operation can also be performed.

-Transmission operation 1 (Alt1): Drop all corresponding SRS resources

-Transmission operation 2 (Alt2): (including RF retuning time) drops only for collided SRS port(s)

- Transmission operation 3 (Alt3): (including RF retuning time) Transmission of collided SRS resources is delayed until the next valid transmission opportunity (by next periodicity or next valid UL slot).

Here, the SRS resource collision may be defined as an overlap (with ACK/NACK resources) of part or all of the frequency and/or time domain.

The above-described embodiments 1 and 2 proposed an SRS transmission method based on UL/DL channel reciprocity considering port-wise frequency hopping for accurate channel measurement. Considering Embodiment 1 and/or Embodiment 2, RF tuning may be required as the frequency gap between bands increases. Considering this, it may be necessary to set a timing gap. The timing gap may be set based on the SRS resource (or SRS resource set) settings of Embodiments 1 and 2. The timing gap may not be applied when a plurality of CCs or BWPs are simultaneously active.

9 is a diagram for explaining signaling between a base station and a terminal based on the above-described embodiments.

Referring to FIG. 9 , a base station may be a general term for objects that transmit and receive data to and from a terminal. For example, the base station may be a concept including one or more transmission points (TPs), one or more transmission and reception points (TRPs), and the like. Also, the TP and/or the TRP may include a panel of a base station, a transmission and reception unit, and the like. In addition, “TRP” refers to a panel, an antenna array, a cell (e.g. macro cell / small cell / pico cell, etc.), TP (transmission point), base station (base station, gNB, etc.) It can be applied by replacing it with expressions such as As described above, TRPs may be classified according to information (eg, index, ID) on the CORESET group (or CORESET pool). For example, when one UE is configured to transmit/receive with multiple TRPs (or cells), this may mean that multiple CORESET groups (or CORESET pools) are configured for one UE. Configuration of such a CORESET group (or CORESET pool) may be performed through higher layer signaling (eg, RRC signaling, etc.).

The base station (BS) may transmit SRS configuration to the UE (M105). That is, the UE may receive SRS configuration from the base station (M105). For example, the SRS setting may include setting information related to transmission and reception of the SRS based on the above-described proposed method (eg, embodiment 1 and/or embodiment 2). For example, SRS configuration includes SRS resource configuration (e.g. SRS-Resource Set / SRS-Resource), SRS resource type (e.g. aperiodic / semi-persistent / periodic), Usage (eg, antenna switching, codebook, non-codebook, beammanagement and / or reciprocity measurement, etc.) and/or information on the number of SRS ports. Here, the SRS configuration may be transmitted to the UE through a higher layer signal (RRC or MAC CE) or a physical layer signal (DCI).

Alternatively, as described in the above-described proposed method (eg, embodiment 1 and/or embodiment 2, etc.), at least one SRS resource or SRS resource set may be set/instructed based on the SRS configuration. Each SRS resource included in the at least one SRS resource may correspond to or be associated with a different CC (or BWP).

For example, the UE or base station may set a mapping relationship between SRS resources and ports based on the SRS configuration, or a mapping relationship between SRS resources and ports. Alternatively, the SRS ports included in each SRS resource may correspond to or be mapped to different Tx chains or Tx ports of the UE based on the SRS configuration. Alternatively, the UL band (or BWP) for channel acquisition using SRS may be preset to a UL band (or BWP) close to the DL (active) band (or BWP) configured for the UE based on the SRS configuration. Alternatively, a timing gap considering component carrier or BWP switching may be set based on the SRS configuration.

Next, the base station may transmit control information or configuration information to the UE (M110). The UE may receive the control information or configuration information from the base station. Here, the control information or configuration information may be transmitted/received through DCI, and may include configuration or control information related to transmission of SRS and/or UL channels. The control information or configuration information may include information for triggering SRS transmission. For example, the UE may trigger one or more SRS resources or SRS resource sets based on control information or configuration information. Alternatively, the UE may set SRS related information based on control information or configuration information.

Next, the base station may receive the SRS/UL channel from the UE (M115). That is, the UE may transmit the SRS/UL channel to the base station. For example, the SRS/UL channel may be received/transmitted based on the above-described control information or the SRS configuration. For example, the UE may transmit the SRS/UL channel according to the above-described embodiment 1 and/or embodiment 2.

Alternatively, the SRS/UL channel may be transmitted/received based on port-wise frequency hopping. For example, mapping between an SRS port and CC/BWP according to frequency hopping, transmission order and/or location may be set in the order described in the above-described embodiment 1 and/or embodiment 2.

Alternatively, the UE may drop the SRS or delay transmission of the collided SRS until the next valid transmission opportunity when there is a collision between channels (e.g. PUCCH / PUSCH) in which SRS and HARQ-ACK (e.g. ACK / NACK) information is transmitted. can

Next, the base station may transmit a DL reference signal (eg, CSI-RS) to the UE (M120). The base station may obtain characteristic information (eg, basis vector for UL channel/delay, etc.) of the UL channel based on the SRS or UL channel received in step M115, and transmit a DL reference signal based on the obtained characteristic information there is. Here, the DL reference signal may be used for CSI measurement for a DL channel in the UE.

10 is a flowchart for explaining a method for a terminal to transmit SRS for a plurality of uplink bands.

Referring to FIG. 10, the terminal may receive SRS configuration information for a plurality of uplink bands from the base station (S201). The SRS configuration information is an SRS resource for each of a plurality of uplink bands (or a plurality of CCs, a plurality of BWPs) or a plurality of uplink bands, an SRS port, use of the SRS resource, and SRS resource type. You can instruct the settings for etc.

Specifically, the SRS configuration information may include information on at least one SRS resource and an SRS resource set through which SRS transmission is performed for a plurality of uplink bands. The SRS configuration information may include information for allocating at least one SRS port for an SRS resource for each of the plurality of uplink bands. For example, the terminal may configure at least one SRS port through which the SRS is transmitted in each uplink band based on the SRS configuration information. Alternatively, the terminal may distribute and allocate a plurality of SRS ports to each of the plurality of uplink bands based on the SRS configuration information. Here, at least one SRS port allocated to each uplink band may be different from at least one SRS port allocated to other uplink bands. That is, the SRS configuration information may allocate at least one SRS port that does not overlap among the uplink bands for each of the plurality of uplink bands.

For example, when the plurality of uplink bands are N and the plurality of SRS ports provided in the terminal are K, the terminal provides K/N number of non-overlapping uplink bands based on the SRS configuration information. An SRS port may be allocated to each of a plurality of uplink bands.

Alternatively, the SRS configuration information may include configuration information for SRS transmission in each of a plurality of UL bands based on UL band switching. For example, the SRS configuration information may further include configuration information on a timing gap for band switching between UL bands, and the timing gap may be previously configured based on the size of a frequency interval between UL bands.

In addition, the SRS configuration information may further include information on usage of at least one SRS resource for the plurality of uplink bands. As described above, the at least one SRS resource may be an SRS resource for channel measurement based on reciprocity between uplink and downlink.

Next, the terminal may receive control information for requesting or triggering SRS transmission based on the SRS configuration information from the base station (S203). In this case, the terminal may allocate or configure an SRS frequency resource, an SRS time resource, and/or an SRS port for transmission of the SRS for each of the plurality of uplink bands based on the control information and the SRS configuration information. .

Next, the terminal may transmit the SRS to each of the plurality of uplink bands based on the SRS configuration information and/or the control information (S205). Here, the terminal may simultaneously transmit the SRS in each of the plurality of uplink bands or sequentially transmit the SRS in each uplink band through an uplink band switching operation (when RF tuning is required). In addition, the terminal may transmit the SRS in each of a plurality of uplink bands based on the above-described embodiment 1.

Alternatively, the terminal may transmit an SRS signal in each uplink band through at least one SRS port allocated based on the SRS configuration information. That is, the SRS can be transmitted for each uplink band through at least one SRS port allocated for each uplink band. Alternatively, the terminal may sequentially transmit the SRS based on the SRS port set for each uplink band through an uplink band switching operation based on the SRS configuration information. When an uplink band switching operation is required, the terminal may sequentially transmit the SRS for each uplink band based on the timing gap included in the SRS configuration information.

For example, the plurality of uplink bands include a first uplink band and a second uplink band, and the plurality of SRS ports include SRS port #0, SRS port #1, SRS port #2, and SRS port #3. can include In this case, the SRS configuration information includes information for setting the first SRS resource for the first uplink band and SRS port #0 and SRS port #1 for the first uplink band (or the first SRS resource). Information for allocating SRS port #2 and SRS port #3 to information for setting the second SRS resource for the second uplink band and information for setting the second uplink band (or the second SRS resource) information may be included. At this time, the terminal may transmit the first SRS through the SRS port #0 and the SRS port #1 in the first uplink band (or in the first SRS resource), and in the second uplink band (or, in the second SRS resource), the second SRS may be transmitted through the SRS port #2 and the SRS port #3. The terminal can simultaneously transmit the first SRS and the second SRS when it has the ability to simultaneously activate the first uplink band and the second uplink band. Alternatively, when the terminal can activate any one of the first uplink band and the second uplink band, the uplink band after transmitting the first SRS in the first uplink band A switching operation may be performed, and the second SRS may be sequentially transmitted in the second uplink band.

Alternatively, the terminal may receive a downlink reference signal from at least one preconfigured downlink band. The downlink reference signal may be configured based on SRSs transmitted by the terminal for each UL band. For example, through transmission of the SRS for each of the plurality of uplink bands as described above (in addition, a method of setting the SRS port differently for each uplink band), the base station transmits the UL band (or uplink band, uplink channel) It is possible to obtain various channel information about the . In this case, the base station receives basis vectors and/or delay information (channel spatial domain information and/or channel time delay information) for each uplink band in each uplink band even if it is not reported through CSI reporting. It is possible to obtain fairly accurate base vector and/or delay information from the obtained SRSs, and accurately determine downlink channel conditions based on the obtained base vector and/or delay information (considering the UL/DL reciprocity method described above). It can be estimated, and a downlink reference signal (eg, CSI-RS) corresponding to the estimated downlink channel state can be set or determined and provided to the terminal.

Alternatively, when the terminal needs to transmit the SRS again in the plurality of UL bands (eg, when the transmission of the SRS is triggered again after performing the transmission of the SRS), the terminal transmits the SRS configuration information An index of at least one SRS port allocated to each uplink band may be hopped based on a predetermined hopping pattern. Alternatively, the terminal may transmit the SRS for each uplink band by hopping the index of the SRS port configured for each uplink band according to the method suggested in the above-described embodiment 2.

For example, the predetermined hopping pattern may be a pattern in which the indexes of the SRS ports are changed in ascending or descending order. Alternatively, the predetermined hopping pattern may be a pattern that is changed according to an ascending order of indexes of UL bands indicated in correspondence with at least one SRS port in the SRS configuration information. For example, when the SRS port #0 and SRS port #1 are set for uplink band #1 according to the SRS configuration information, and the SRS port #2 and SRS port #3 are set for uplink band #2, According to the predetermined hopping pattern, the index of the SRS port for the uplink band #1 is hopped to the SRS port #2 and the SRS port #3, and the index of the SRS port for the uplink band #2 is the SRS port index. It can hop to #0 and SRS port #1.

11 is a flowchart illustrating a method for a base station to receive an SRS from each of a plurality of uplink bands.

Referring to FIG. 11, the base station may transmit SRS configuration information to the terminal (S301). The SRS configuration information may indicate settings for an SRS resource for each of a plurality of uplink bands (or a plurality of CCs or a plurality of BWPs), an SRS port, and a purpose of the SRS resource.

Specifically, the SRS configuration information may include information on at least one SRS resource and an SRS resource set through which SRS transmission is performed for a plurality of uplink bands. The SRS configuration information may include information for allocating at least one SRS port for an SRS resource for each of the plurality of uplink bands. Based on the number of SRS ports included in the terminal and the number of uplink bands configured in the terminal, the base station may distribute and set the plurality of SRS ports to each uplink band so as not to overlap.

For example, when the plurality of uplink bands are N and the number of SRS ports provided in the terminal is K, the base station bases K/N number of non-overlapping uplink bands based on the SRS configuration information. The SRS configuration information for allocating an SRS port to each of a plurality of uplink bands may be transmitted to the terminal.

Alternatively, the SRS configuration information may include configuration information for SRS transmission in each of a plurality of UL bands based on UL band switching. For example, the SRS configuration information may further include configuration information on a timing gap for band switching between UL bands, and the timing gap may be previously configured based on the size of a frequency interval between UL bands.

In addition, the SRS configuration information may further include information on usage of at least one SRS resource for the plurality of uplink bands. As described above, the at least one SRS resource may be an SRS resource for channel measurement based on reciprocity between uplink and downlink.

Next, the base station may transmit control information for requesting or triggering SRS transmission based on the SRS configuration information to the terminal (S303). In this case, the control information may further include information indicating an SRS transmission opportunity (or SRS time resource) to transmit the SRS among SRS transmission opportunities configured from the SRS configuration information.

Next, the base station may receive at least one SRS transmitted in each uplink band from the terminal (S305). Here, the SRSs may be simultaneously received in each of the plurality of uplink bands or sequentially received in each uplink band based on an uplink band switching operation. Alternatively, the base station may receive SRSs transmitted in each uplink band in a manner set with reference to FIG. 10 .

Alternatively, the base station may determine a downlink reference signal for at least one downlink band preconfigured for the terminal based on the received SRSs and transmit the determined downlink reference signal to the terminal (S307). The downlink reference signal may be set based on the SRS transmitted by the terminal for each UL band. For example, through transmission of the SRS for each of the plurality of uplink bands as described above (in addition, a method of setting the SRS port differently for each uplink band), the base station transmits the UL band (or uplink band, uplink channel) It is possible to obtain various channel information about the . In this case, the base station does not report the basis vector and/or delay information (or channel spatial domain information and/or channel time delay information) for each uplink band through CSI reporting. It is possible to obtain the base vector and / or delay information that is fairly accurate from the received SRSs, and based on the obtained base vector and / or delay information (considering the UL / DL reciprocity method described above), the channel state of the downlink It is possible to accurately estimate , and set or determine a downlink reference signal (eg, CSI-RS) that matches the estimated downlink channel state and provide it to the terminal.

Alternatively, when the base station transmits the control information again to trigger transmission of the SRS again, the base station performs port-wise frequency hopping for each uplink band from the terminal. Can receive the SRSs through at least one SRS port there is. Alternatively, the base station may receive an SRS transmitted by performing port-wise frequency hopping in the manner described with reference to the above-described embodiment 2 and/or FIG. 10 in each uplink band.

Examples of communication systems to which the invention is applied

Although not limited thereto, various descriptions, functions, procedures, proposals, methods and / or operational flowcharts of the present invention disclosed in this document can be applied to various fields requiring wireless communication / connection (eg, 5G) between devices. there is.

Hereinafter, it will be exemplified in more detail with reference to the drawings. In the following drawings/description, the same reference numerals may represent the same or corresponding hardware blocks, software blocks or functional blocks unless otherwise specified.

12 illustrates a communication system applied to the present invention.

Referring to FIG. 12, a communication system 1 applied to the present invention includes a wireless device, a base station and a network. Here, the wireless device means a device that performs communication using a radio access technology (eg, 5G New RAT (NR), Long Term Evolution (LTE)), and may be referred to as a communication/wireless/5G device. Although not limited thereto, wireless devices include robots 100a, vehicles 100b-1 and 100b-2, XR (eXtended Reality) devices 100c, hand-held devices 100d, and home appliances 100e. ), an Internet of Thing (IoT) device 100f, and an AI device/server 400. For example, the vehicle may include a vehicle equipped with a wireless communication function, an autonomous vehicle, a vehicle capable of performing inter-vehicle communication, and the like. Here, the vehicle may include an Unmanned Aerial Vehicle (UAV) (eg, a drone). XR devices include Augmented Reality (AR)/Virtual Reality (VR)/Mixed Reality (MR) devices, Head-Mounted Devices (HMDs), Head-Up Displays (HUDs) installed in vehicles, televisions, smartphones, It may be implemented in the form of a computer, wearable device, home appliance, digital signage, vehicle, robot, and the like. A portable device may include a smart phone, a smart pad, a wearable device (eg, a smart watch, a smart glass), a computer (eg, a laptop computer, etc.), and the like. Home appliances may include a TV, a refrigerator, a washing machine, and the like. IoT devices may include sensors, smart meters, and the like. For example, a base station and a network may also be implemented as a wireless device, and a specific wireless device 200a may operate as a base station/network node to other wireless devices.

The wireless devices 100a to 100f may be connected to the network 300 through the base station 200 . AI (Artificial Intelligence) technology may be applied to the wireless devices 100a to 100f, and the wireless devices 100a to 100f may be connected to the AI server 400 through the network 300. The network 300 may be configured using a 3G network, a 4G (eg LTE) network, or a 5G (eg NR) network. The wireless devices 100a to 100f may communicate with each other through the base station 200/network 300, but may also communicate directly (eg, sidelink communication) without going through the base station/network. For example, the vehicles 100b-1 and 100b-2 may perform direct communication (eg, vehicle to vehicle (V2V)/vehicle to everything (V2X) communication). In addition, IoT devices (eg, sensors) may directly communicate with other IoT devices (eg, sensors) or other wireless devices 100a to 100f.

Wireless communication/connection 150a, 150b, and 150c may be performed between the wireless devices 100a to 100f/base station 200 and the base station 200/base station 200. Here, wireless communication/connection refers to various wireless connections such as uplink/downlink communication 150a, sidelink communication 150b (or D2D communication), and inter-base station communication 150c (e.g. relay, Integrated Access Backhaul (IAB)). This can be achieved through technology (eg, 5G NR) Wireless communication/connection (150a, 150b, 150c) allows wireless devices and base stations/wireless devices, and base stations and base stations to transmit/receive radio signals to/from each other. For example, the wireless communication/connection 150a, 150b, and 150c may transmit/receive signals through various physical channels.To this end, based on various proposals of the present invention, for transmission/reception of radio signals At least some of various configuration information setting processes, various signal processing processes (eg, channel encoding/decoding, modulation/demodulation, resource mapping/demapping, etc.), resource allocation processes, etc. may be performed.

Examples of wireless devices to which the present invention is applied

13 illustrates a wireless device that can be applied to the present invention.

Referring to FIG. 13 , the first wireless device 100 and the second wireless device 200 may transmit and receive radio signals through various radio access technologies (eg, LTE, NR). Here, {the first wireless device 100, the second wireless device 200} is the {wireless device 100x, the base station 200} of FIG. 12 and/or the {wireless device 100x, the wireless device 100x. } can correspond.

The first wireless device 100 includes one or more processors 102 and one or more memories 104, and may additionally include one or more transceivers 106 and/or one or more antennas 108. The processor 102 controls the memory 104 and/or the transceiver 106 and may be configured to implement the descriptions, functions, procedures, suggestions, methods and/or flowcharts of operations disclosed herein. For example, the processor 102 may process information in the memory 104 to generate first information/signal, and transmit a radio signal including the first information/signal through the transceiver 106. In addition, the processor 102 may receive a radio signal including the second information/signal through the transceiver 106, and then store information obtained from signal processing of the second information/signal in the memory 104. The memory 104 may be connected to the processor 102 and may store various information related to the operation of the processor 102 . For example, memory 104 may perform some or all of the processes controlled by processor 102, or instructions for performing the descriptions, functions, procedures, suggestions, methods, and/or flowcharts of operations disclosed herein. It may store software codes including them. Here, the processor 102 and memory 104 may be part of a communication modem/circuit/chipset designed to implement a wireless communication technology (eg, LTE, NR). The transceiver 106 may be coupled to the processor 102 and may transmit and/or receive wireless signals via one or more antennas 108 . The transceiver 106 may include a transmitter and/or a receiver. The transceiver 106 may be used interchangeably with a radio frequency (RF) unit. In the present invention, a wireless device may mean a communication modem/circuit/chipset.

According to one example, the first wireless device 100 may include a processor 102 and a memory 104 connected to the RF transceiver. The memory 104 may include at least one program capable of performing an operation related to the embodiments described in FIGS. 9 to 11 .

Specifically, the processor 102 controls the RF transceiver 106 to receive SRS configuration information for the plurality of uplink bands from a base station, and in each of the plurality of uplink bands based on the SRS configuration information. The SRS may be transmitted to the base station. Here, the SRS transmitted in each of the plurality of uplink bands is transmitted through at least one SRS port allocated by the SRS configuration information, and the at least one SRS port is transmitted for each of the plurality of uplink bands. may be assigned differently.

Alternatively, a chip set including the processor 102 and the memory 104 may be configured. In this case, the chipset includes at least one processor and at least one memory operatively connected to the at least one processor and, when executed, causing the at least one processor to perform an operation, the operation comprising the plurality of Receiving SRS configuration information for uplink bands of from a base station, and transmitting the SRS to the base station in each of the plurality of uplink bands based on the SRS configuration information. Here, the SRS transmitted in each of the plurality of uplink bands is transmitted through at least one SRS port allocated by the SRS configuration information, and the at least one SRS port is transmitted for each of the plurality of uplink bands. may be assigned differently. Also, the at least one processor may perform operations for the embodiments described in FIGS. 9 to 11 based on a program included in a memory.

Alternatively, a computer readable storage medium including at least one computer program for causing the at least one processor to perform an operation is provided, wherein the operation includes receiving SRS configuration information for the plurality of uplink bands from a base station. and transmitting the SRS to the base station in each of the plurality of uplink bands based on the SRS configuration information. Here, the SRS transmitted in each of the plurality of uplink bands is transmitted through at least one SRS port allocated by the SRS configuration information, and the at least one SRS port is transmitted for each of the plurality of uplink bands. may be assigned differently. Also, the computer program may include programs capable of performing operations for the embodiments described in FIGS. 9 to 11 .

The second wireless device 200 includes one or more processors 202, one or more memories 204, and may further include one or more transceivers 206 and/or one or more antennas 208. Processor 202 controls memory 204 and/or transceiver 206 and may be configured to implement the descriptions, functions, procedures, suggestions, methods, and/or flowcharts of operations disclosed herein. For example, the processor 202 may process information in the memory 204 to generate third information/signal, and transmit a radio signal including the third information/signal through the transceiver 206. In addition, the processor 202 may receive a radio signal including the fourth information/signal through the transceiver 206 and store information obtained from signal processing of the fourth information/signal in the memory 204 . The memory 204 may be connected to the processor 202 and may store various information related to the operation of the processor 202 . For example, memory 204 may perform some or all of the processes controlled by processor 202, or instructions for performing the descriptions, functions, procedures, suggestions, methods, and/or flowcharts of operations disclosed herein. It may store software codes including them. Here, the processor 202 and memory 204 may be part of a communication modem/circuit/chip designed to implement a wireless communication technology (eg, LTE, NR). The transceiver 206 may be coupled to the processor 202 and may transmit and/or receive wireless signals via one or more antennas 208 . The transceiver 206 may include a transmitter and/or a receiver. The transceiver 206 may be used interchangeably with an RF unit. In the present invention, a wireless device may mean a communication modem/circuit/chip.

According to one embodiment, the base station may include a processor 202 , a memory 204 and/or a transceiver 206 . The processor controls the transceiver 206 or the RF transceiver to transmit SRS configuration information for the plurality of uplink bands to the UE, and receives the SRS in each of the plurality of uplink bands based on the SRS configuration information. can do. Here, the SRS configuration information includes information for allocating at least one SRS port through which the SRS is transmitted in each of the plurality of uplink bands, and the at least one SRS port is assigned to each of the plurality of uplink bands. may be assigned differently. In addition, the processor may perform the above-described operations based on the memory 104 including at least one program capable of performing operations related to the embodiments described in FIGS. 9 to 11 .

Hereinafter, hardware elements of the wireless devices 100 and 200 will be described in more detail. Although not limited to this, one or more protocol layers may be implemented by one or more processors 102, 202. For example, one or more processors 102, 202 may implement one or more layers (eg, functional layers such as PHY, MAC, RLC, PDCP, RRC, SDAP). One or more processors 102, 202 may generate one or more Protocol Data Units (PDUs) and/or one or more Service Data Units (SDUs) in accordance with the descriptions, functions, procedures, proposals, methods and/or operational flow charts disclosed herein. can create One or more processors 102, 202 may generate messages, control information, data or information according to the descriptions, functions, procedures, proposals, methods and/or operational flow diagrams disclosed herein. One or more processors 102, 202 generate PDUs, SDUs, messages, control information, data or signals (e.g., baseband signals) containing information according to the functions, procedures, proposals and/or methods disclosed herein , can be provided to one or more transceivers 106, 206. One or more processors 102, 202 may receive signals (eg, baseband signals) from one or more transceivers 106, 206, and descriptions, functions, procedures, proposals, methods, and/or flowcharts of operations disclosed herein PDUs, SDUs, messages, control information, data or information can be obtained according to these.

One or more processors 102, 202 may be referred to as a controller, microcontroller, microprocessor or microcomputer. One or more processors 102, 202 may be implemented by hardware, firmware, software, or a combination thereof. For example, one or more Application Specific Integrated Circuits (ASICs), one or more Digital Signal Processors (DSPs), one or more Digital Signal Processing Devices (DSPDs), one or more Programmable Logic Devices (PLDs), or one or more Field Programmable Gate Arrays (FPGAs). may be included in one or more processors 102 and 202. The descriptions, functions, procedures, proposals, methods and/or operational flowcharts disclosed in this document may be implemented using firmware or software, and the firmware or software may be implemented to include modules, procedures, functions, and the like. Firmware or software configured to perform the descriptions, functions, procedures, suggestions, methods and/or operational flow diagrams disclosed herein may be included in one or more processors 102, 202 or stored in one or more memories 104, 204 and It can be driven by the above processors 102 and 202. The descriptions, functions, procedures, suggestions, methods and/or operational flow charts disclosed in this document may be implemented using firmware or software in the form of codes, instructions and/or sets of instructions.

One or more memories 104, 204 may be coupled with one or more processors 102, 202 and may store various types of data, signals, messages, information, programs, codes, instructions and/or instructions. One or more memories 104, 204 may be comprised of ROM, RAM, EPROM, flash memory, hard drives, registers, cache memory, computer readable storage media, and/or combinations thereof. One or more memories 104, 204 may be located internally and/or external to one or more processors 102, 202. Additionally, one or more memories 104, 204 may be coupled to one or more processors 102, 202 through various technologies, such as wired or wireless connections.

One or more transceivers 106, 206 may transmit user data, control information, radio signals/channels, etc., as referred to in the methods and/or operational flow charts herein, to one or more other devices. One or more transceivers 106, 206 may receive user data, control information, radio signals/channels, etc. referred to in descriptions, functions, procedures, proposals, methods and/or operational flow charts, etc. disclosed herein from one or more other devices. there is. For example, one or more transceivers 106 and 206 may be connected to one or more processors 102 and 202 and transmit and receive wireless signals. For example, one or more processors 102, 202 may control one or more transceivers 106, 206 to transmit user data, control information, or radio signals to one or more other devices. Additionally, one or more processors 102, 202 may control one or more transceivers 106, 206 to receive user data, control information, or radio signals from one or more other devices. In addition, one or more transceivers 106, 206 may be coupled with one or more antennas 108, 208, and one or more transceivers 106, 206 via one or more antennas 108, 208, as described herein, function. , procedures, proposals, methods and / or operation flowcharts, etc. can be set to transmit and receive user data, control information, radio signals / channels, etc. In this document, one or more antennas may be a plurality of physical antennas or a plurality of logical antennas (eg, antenna ports). One or more transceivers (106, 206) convert the received radio signals/channels from RF band signals in order to process the received user data, control information, radio signals/channels, etc. using one or more processors (102, 202). It can be converted into a baseband signal. One or more transceivers 106 and 206 may convert user data, control information, and radio signals/channels processed by one or more processors 102 and 202 from baseband signals to RF band signals. To this end, one or more of the transceivers 106, 206 may include (analog) oscillators and/or filters.

Example of using a wireless device to which the present invention is applied

14 shows another example of a wireless device applied to the present invention. A wireless device may be implemented in various forms according to use-case/service.

Referring to FIG. 14, wireless devices 100 and 200 correspond to the wireless devices 100 and 200 of FIG. 14, and include various elements, components, units/units, and/or modules. ) can be configured. For example, the wireless devices 100 and 200 may include a communication unit 110 , a control unit 120 , a memory unit 130 and an additional element 140 . The communication unit may include communication circuitry 112 and transceiver(s) 114 . For example, communication circuitry 112 may include one or more processors 102, 202 of FIG. 14 and/or one or more memories 104, 204. For example, transceiver(s) 114 may include one or more transceivers 106, 206 of FIG. 14 and/or one or more antennas 108, 208. The control unit 120 is electrically connected to the communication unit 110, the memory unit 130, and the additional element 140 and controls overall operations of the wireless device. For example, the control unit 120 may control electrical/mechanical operations of the wireless device based on programs/codes/commands/information stored in the memory unit 130. In addition, the control unit 120 transmits the information stored in the memory unit 130 to the outside (eg, another communication device) through the communication unit 110 through a wireless/wired interface, or transmits the information stored in the memory unit 130 to the outside (eg, another communication device) through the communication unit 110. Information received through a wireless/wired interface from other communication devices) may be stored in the memory unit 130 .

The additional element 140 may be configured in various ways according to the type of wireless device. For example, the additional element 140 may include at least one of a power unit/battery, an I/O unit, a driving unit, and a computing unit. Although not limited thereto, the wireless device may be a robot (Fig. 13, 100a), a vehicle (Fig. 13, 100b-1, 100b-2), an XR device (Fig. 13, 100c), a mobile device (Fig. 13, 100d), a home appliance. (FIG. 13, 100e), IoT device (FIG. 13, 100f), digital broadcasting terminal, hologram device, public safety device, MTC device, medical device, fintech device (or financial device), security device, climate/environmental device, It may be implemented in the form of an AI server/device (Fig. 13, 400), a base station (Fig. 13, 200), a network node, and the like. Wireless devices can be mobile or used in a fixed location depending on the use-case/service.

In FIG. 14 , various elements, components, units/units, and/or modules in the wireless devices 100 and 200 may be entirely interconnected through a wired interface or at least partially connected wirelessly through the communication unit 110. For example, in the wireless devices 100 and 200, the control unit 120 and the communication unit 110 are connected by wire, and the control unit 120 and the first units (eg, 130 and 140) are connected through the communication unit 110. Can be connected wirelessly. Additionally, each element, component, unit/unit, and/or module within the wireless device 100, 200 may further include one or more elements. For example, the control unit 120 may be composed of one or more processor sets. For example, the controller 120 may include a set of a communication control processor, an application processor, an electronic control unit (ECU), a graphic processing processor, a memory control processor, and the like. As another example, the memory unit 130 may include random access memory (RAM), dynamic RAM (DRAM), read only memory (ROM), flash memory, volatile memory, and non-volatile memory. volatile memory) and/or a combination thereof.

Here, the wireless communication technology implemented in the wireless device (XXX, YYY) of the present specification may include LTE, NR, and 6G as well as narrowband Internet of Things for low power communication. At this time, for example, NB-IoT technology may be an example of LPWAN (Low Power Wide Area Network) technology, and may be implemented in standards such as LTE Cat NB1 and / or LTE Cat NB2. no. Additionally or alternatively, the wireless communication technology implemented in the wireless device (XXX, YYY) of the present specification may perform communication based on LTE-M technology. At this time, as an example, LTE-M technology may be an example of LPWAN technology, and may be called various names such as eMTC (enhanced machine type communication). For example, LTE-M technologies are 1) LTE CAT 0, 2) LTE Cat M1, 3) LTE Cat M2, 4) LTE non-BL (non-Bandwidth Limited), 5) LTE-MTC, 6) LTE Machine Type Communication, and/or 7) It may be implemented in at least one of various standards such as LTE M, and is not limited to the above-mentioned names. Additionally or alternatively, the wireless communication technology implemented in the wireless device (XXX, YYY) of the present specification is at least one of ZigBee, Bluetooth, and Low Power Wide Area Network (LPWAN) considering low power communication It may include any one, and is not limited to the above-mentioned names. For example, ZigBee technology can generate personal area networks (PANs) related to small/low-power digital communication based on various standards such as IEEE 802.15.4, and can be called various names.

The embodiments described above are those in which elements and features of the present invention are combined in a predetermined form. Each component or feature should be considered optional unless explicitly stated otherwise. Each component or feature may be implemented in a form not combined with other components or features. It is also possible to configure an embodiment of the present invention by combining some components and/or features. The order of operations described in the embodiments of the present invention may be changed. Some components or features of one embodiment may be included in another embodiment, or may be replaced with corresponding components or features of another embodiment. It is obvious that claims that do not have an explicit citation relationship in the claims can be combined to form an embodiment or can be included as new claims by amendment after filing.

Embodiments of the present invention in this document have been mainly described with a focus on a signal transmission/reception relationship between a terminal and a base station. This transmission/reception relationship extends equally/similarly to signal transmission/reception between a terminal and a relay or between a base station and a relay. A specific operation described in this document as being performed by a base station may be performed by its upper node in some cases. That is, it is obvious that various operations performed for communication with a terminal in a network composed of a plurality of network nodes including a base station may be performed by the base station or network nodes other than the base station. A base station may be replaced by terms such as a fixed station, a Node B, an eNode B (eNB), an access point, and the like. In addition, the terminal may be replaced with terms such as User Equipment (UE), Mobile Station (MS), and Mobile Subscriber Station (MSS).

An embodiment according to the present invention may be implemented by various means, for example, hardware, firmware, software, or a combination thereof. In the case of hardware implementation, one embodiment of the present invention provides one or more application specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), FPGAs ( field programmable gate arrays), processors, controllers, microcontrollers, microprocessors, etc.

In the case of implementation by firmware or software, an embodiment of the present invention may be implemented in the form of a module, procedure, or function that performs the functions or operations described above. The software codes may be stored in a memory unit and driven by a processor. The memory unit may be located inside or outside the processor and exchange data with the processor by various means known in the art.

It is apparent to those skilled in the art that the present invention can be embodied in other specific forms without departing from the characteristics of the present invention. Accordingly, the above detailed description should not be construed as limiting in all respects and should be considered illustrative. The scope of the present invention should be determined by reasonable interpretation of the appended claims, and all changes within the equivalent scope of the present invention are included in the scope of the present invention.

Embodiments of the present invention as described above can be applied to various mobile communication systems.

Claims (15)

In a method for a terminal to transmit a sounding reference signal (SRS) for a plurality of uplink bands in a wireless communication system,
Receiving SRS configuration information for the plurality of uplink bands from a base station; and
Transmitting the SRS in each of the plurality of uplink bands based on the SRS configuration information; Including,
The SRS is transmitted through at least one SRS port allocated to each of the plurality of uplink bands by the SRS configuration information,
Wherein the at least one SRS port is allocated differently for each of the plurality of uplink bands. According to claim 1,
Characterized in that the SRS configuration information configures at least one SRS resource for channel measurement based on reciprocity between uplink and downlink. According to claim 1,
When the plurality of uplink bands are N and the plurality of SRS ports provided in the terminal are K, the SRS configuration information configures K/N SRS ports to be distributed to each of the plurality of uplink bands. How to do it. According to claim 1,
Further comprising receiving at least one downlink reference signal from the base station;
Characterized in that the at least one downlink reference signal is generated based on channel spatial domain information and channel time delay information obtained from SRSs transmitted in each of the uplink bands. According to claim 1,
The terminal transmits the SRS in each of the plurality of uplink bands through at least one SRS port allocated by the SRS configuration information based on first control information triggering transmission of the SRS from the base station Characterized in that, the method. According to claim 5,
When the terminal receives second control information from the base station after transmitting the SRS in each of the plurality of uplink bands, the at least one SRS allocated to each of the uplink bands according to a preconfigured hopping pattern characterized by hopping the index of the port. According to claim 1,
Among the plurality of uplink bands, a first time resource unit for transmitting the SRS for a first uplink band and a second time resource unit for instructing transmission of HARQ-ACK for the first uplink band Characterized in that, when overlapping with each other, all transmissions of the SRS for the first uplink band are dropped. According to claim 1,
The SRS configuration information further comprises information on a time gap for switching between the plurality of uplink bands. In a method for a base station to receive a sounding reference signal (SRS) for a plurality of uplink bands in a wireless communication system,
Transmitting SRS configuration information for the plurality of uplink bands to a terminal; and
Receiving the SRS in each of the plurality of uplink bands based on the SRS configuration information;
The SRS configuration information includes information for allocating at least one SRS port through which the SRS is transmitted in each of the plurality of uplink bands;
Wherein the at least one SRS port is allocated differently for each of the plurality of uplink bands. According to claim 9,
Characterized in that the SRS configuration information configures at least one SRS resource for channel measurement based on reciprocity between uplink and downlink. According to claim 9,
The base station transmits at least one downlink reference signal determined based on channel spatial domain information and channel time delay information obtained from SRSs transmitted in each of the uplink bands to the terminal. How to. In a terminal transmitting a sounding reference signal (SRS) for a plurality of uplink bands in a wireless communication system,
a radio frequency (RF) transceiver; and
A processor connected to the RF transceiver;
The processor controls the RF transceiver to receive SRS configuration information for the plurality of uplink bands from a base station, and transmits the SRS to the base station in each of the plurality of uplink bands based on the SRS configuration information, ,
The SRS is transmitted through at least one SRS port allocated to each of the plurality of uplink bands by the SRS configuration information, and the at least one SRS port is differently allocated to each of the plurality of uplink bands. Become, terminal. In a base station for receiving a sounding reference signal (SRS) for a plurality of uplink bands in a wireless communication system,
a radio frequency (RF) transceiver; and
A processor connected to the RF transceiver;
The processor controls the RF transceiver to transmit SRS configuration information for the plurality of uplink bands to a terminal, and receives the SRS in each of the plurality of uplink bands based on the SRS configuration information,
The SRS configuration information includes information for allocating at least one SRS port through which the SRS is transmitted in each of the plurality of uplink bands, and the at least one SRS port is different for each of the plurality of uplink bands. Base station, which is assigned to the base station. In a chip set for transmitting a sounding reference signal (SRS) for a plurality of uplink bands in a wireless communication system,
at least one processor; and
at least one memory operatively connected to the at least one processor and, when executed, causing the at least one processor to perform operations, the operations comprising:
Receiving SRS configuration information for the plurality of uplink bands from a base station, and transmitting the SRS to the base station in each of the plurality of uplink bands based on the SRS configuration information,
The SRS is transmitted through at least one SRS port allocated to each of the plurality of uplink bands by the SRS configuration information, and the at least one SRS port is differently allocated to each of the plurality of uplink bands. That's it, the chipset. A computer-readable storage medium containing at least one computer program that performs an operation of transmitting a sounding reference signal (SRS) for a plurality of uplink bands in a wireless communication system,
at least one computer program for causing the at least one processor to transmit the SRS; and
A computer-readable storage medium in which the at least one computer program is stored,
The operation may include receiving SRS configuration information for the plurality of uplink bands from a base station, and transmitting the SRS to the base station in each of the plurality of uplink bands based on the SRS configuration information,
The SRS is transmitted through at least one SRS port allocated to each of the plurality of uplink bands by the SRS configuration information, and the at least one SRS port is differently allocated to each of the plurality of uplink bands. A computer readable storage medium.

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